| Polypropylene (PP) | Food-contact polypropylene, specified as BPA-free | Approximately 25–45 g | Common product specifications are approximately 100–120°C; confirm the supplier’s repeated-use rating | Usually compatible with boiling-water and steam sterilization; many designs are dishwasher-compatible | Lightweight and impact-resistant; may scratch, discolor or deform if overheated | Low shipping weight, efficient injection molding, broad availability and generally competitive unit cost | May retain odors; lower heat resistance than PPSU; transparent appearance is limited compared with glass | Mass-market, value-focused and high-volume retail programs | Food-contact declaration, BPA-free test report, migration test, sterilization instructions and material identification |
| Polyphenylsulfone (PPSU) | High-temperature engineering polymer, specified as BPA-free | Approximately 45–70 g | Often specified for repeated exposure around 180–220°C, subject to resin grade and finished-product testing | Generally well suited to repeated steam, boiling-water and dishwasher cleaning when approved by the supplier | High impact resistance and better heat-aging performance than standard PP; may show gradual wear or discoloration | Long service-life potential, strong premium positioning and suitability for demanding sterilization routines | Higher material and molding cost; amber or translucent appearance may not suit every visual specification | Premium, hospital-oriented, frequent-sterilization and long-use product ranges | Resin compliance statement, BPA-free and overall migration reports, heat-aging data, sterilization cycle validation and traceability records |
| Food-Grade Silicone | Platinum- or peroxide-cured silicone suitable for food contact | Approximately 80–130 g, depending on wall thickness and collapsible design | Many food-contact grades are specified around −40°C to 180–220°C; verify the complete assembled product rating | Typically compatible with boiling-water, steam and dishwasher cleaning; inspect for trapped moisture after washing | Highly flexible and resistant to shattering; can tear, attract lint or absorb odors if formulation and cleaning are inadequate | Collapsible formats can reduce storage volume; suitable for travel and compact packaging designs | Higher surface friction, possible odor retention and more complex dimensional control during molding | Travel, outdoor, compact-storage and soft-touch product segments | Curing-system declaration, extractables and migration testing, odor evaluation, tensile data, sterilization instructions and BPA-free statement for all non-silicone parts |
| Borosilicate Glass | Heat-resistant borosilicate glass with BPA-free cap and feeding components | Approximately 180–260 g | Glass can tolerate high temperatures, but safe use depends on thermal-shock limits and the assembled bottle design | Generally compatible with boiling-water and steam sterilization; avoid sudden temperature changes unless specifically approved | Excellent scratch and odor resistance; can break if dropped, so protective sleeves may be required | Stable material properties, clear appearance and strong consumer preference for non-polymer bottle bodies in some markets | Heavy freight, higher breakage risk, more protective packaging and increased handling cost | Premium home-use, low-odor, easy-clean and sustainability-focused ranges | Glass composition or food-contact declaration, thermal-shock test, impact or drop test, migration reports and separate compliance documents for caps, seals and nipples |
| Stainless Steel | Food-contact stainless steel, commonly selected from corrosion-resistant grades | Approximately 90–150 g | Metal body tolerates high temperatures, but coatings, seals, handles and feeding components may have lower limits | Often compatible with steam and boiling-water sterilization; confirm compatibility of all attached components | Strong impact resistance and low shatter risk; dents, surface scratches and potential metal taste complaints must be controlled | Durable for travel and outdoor use; recyclable metal body and reduced breakage-related returns | Opaque, limiting visual volume checks; metal composition, welding quality and corrosion resistance require verification | Outdoor, travel, durable-use and reduced-breakage product segments | Steel grade declaration, food-contact migration testing, corrosion test, weld inspection, coating reports and BPA-free documentation for plastic or silicone components |